+ mm-vmalloc-replace-bug_on-to-a-simple-if-statement.patch added to mm-unstable branch

+ mm-vmalloc-replace-bug_on-to-a-simple-if-statement.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/vmalloc: replace BUG_ON with a simple if statement
has been added to the -mm mm-unstable branch.  Its filename is
     mm-vmalloc-replace-bug_on-to-a-simple-if-statement.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmalloc-replace-bug_on-to-a-simple-if-statement.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Hyunmin Lee <hn.min.lee@gmail.com>
Subject: mm/vmalloc: replace BUG_ON with a simple if statement
Date: Wed, 1 Feb 2023 20:51:42 +0900

As per the coding standards, in the event of an abnormal condition that
should not occur under normal circumstances, the kernel should attempt
recovery and proceed with execution, rather than halting the machine.

Specifically, in the alloc_vmap_area() function, use a simple if()
instead of using BUG_ON() halting the machine.

Link: https://lkml.kernel.org/r/20230201115142.GA7772@min-iamroot
Co-Developed-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Co-Developed-by: Jeungwoo Yoo <casionwoo@gmail.com>
Co-Developed-by: Sangyun Kim <sangyun.kim@snu.ac.kr>
Signed-off-by: Hyunmin Lee <hn.min.lee@gmail.com>
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@intel.com>
Signed-off-by: Jeungwoo Yoo <casionwoo@gmail.com>
Signed-off-by: Sangyun Kim <sangyun.kim@snu.ac.kr>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/vmalloc.c~mm-vmalloc-replace-bug_on-to-a-simple-if-statement
+++ a/mm/vmalloc.c
@@ -1587,9 +1587,8 @@ static struct vmap_area *alloc_vmap_area
 	int purged = 0;
 	int ret;
 
-	BUG_ON(!size);
-	BUG_ON(offset_in_page(size));
-	BUG_ON(!is_power_of_2(align));
+	if (unlikely(!size || offset_in_page(size) || !is_power_of_2(align)))
+		return ERR_PTR(-EINVAL);
 
 	if (unlikely(!vmap_initialized))
 		return ERR_PTR(-EBUSY);
_

Patches currently in -mm which might be from hn.min.lee@gmail.com are

mm-vmalloc-replace-bug_on-to-a-simple-if-statement.patch